Which statement best differentiates a mechanical throttle body from an electronic throttle control (drive-by-wire) system?

Which statement best differentiates a mechanical throttle body from an electronic throttle control (drive-by-wire) system?

• A. It is controlled purely through pedal pressure with no electronic input in either system.
• B. It uses a hydraulic actuator in mechanical throttle and a cable in electronic throttle.
• C. They differ only in the throttle plate material.
• D. Mechanical throttle uses a direct linkage to the throttle plate; electronic throttle uses sensors and an ECU-controlled actuator.

Answer: (D)